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I've had similar issues with a sct years ago.it was a failing bec on the esc..but you have a castle bec installed so that kills that idea

not sure what servo you got my my brain says its still servo.Servo is weak in air nor resistance in rev same . put in fwd then you have major stress in turning... take servo out and test it like bill has done on rc groups he put servo in wooden jig with servo tester attached . a weight at floor...